642143445 has 8 divisors (see below), whose sum is σ = 1027429536. Its totient is φ = 342476496.

The previous prime is 642143429. The next prime is 642143459. The reversal of 642143445 is 544341246.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642143445 - 2⁴ = 642143429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21404767 + ... + 21404796.

It is an arithmetic number, because the mean of its divisors is an integer number (128428692).

Almost surely, 2^642143445 is an apocalyptic number.

It is an amenable number.

642143445 is a deficient number, since it is larger than the sum of its proper divisors (385286091).

642143445 is a wasteful number, since it uses less digits than its factorization.

642143445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42809571.

The product of its digits is 46080, while the sum is 33.

The square root of 642143445 is about 25340.5494218259. The cubic root of 642143445 is about 862.7348690338.

The spelling of 642143445 in words is "six hundred forty-two million, one hundred forty-three thousand, four hundred forty-five".